I think the best super I've seen so far is Ratchet's lvl 1, is medium range and lasts like 3 seconds. If you miss there's the possibility that someone lands on it still. Also Sweet Tooth's lvl1 isn't the worst I believe. It's really easy to land and sometimes you can get more than one enemy on the explosion.

I think Ratchet's level 1 is the best, and my favorite. It covers a lot of horizontal range and lasts for 2-3 seconds, so it's easy to let it rip on someone you've knocked down. It's easy to get 3 kills with this one.

A lot of people say that Heihachi's level 2 is the best, but it really depends on the stage. Otherwise, I'd say Raiden's level 2 is the best, and it's a lot of fun to use..

Sackboy and Nariko's level 3s are tied for best. You can get 9 kills with Nariko if you're good with it/on a small map, and Sackboy is basically a guaranteed 6-7 kills.

Why is everyone saying Sir Dan's level 1 is the worst? If you use his up-square attack and your opponent tries to tech out, you can easily lead into it, and on a stage with a lot of platforms and slants it's really easy to land because of how fast it comes out. Big Daddy's level 1 can't even be combo'd into, and you can see it coming from a mile away. I'd say his is far worse.